28. Name atleast two hormones which result in fluctuation of Ca2+ level.
Parathyroid hormone andcalcitonin results in the fluctuation of Ca2+ level. Parathyroid Hormone (PTH) increases the Ca2+ levels in the blood. PTH acts on the bones and stimulates the process of bone resorption (dissolution / demineralisation).
PTH also stimulates reabsorption of Ca2+ by the renal tubules and increases Ca2+ absorption from the digested food.
Calcitonin is a 32-amino acid linear polypeptide hormone,that is produced in humans primarily by the parafollicular cells of the thyroid. It acts by reducing blood calcium (Ca2+) levels opposing the effect of Parathyroid Hormone (PTH).
